Finding the Third Proportional to 3,215.18 and 4,831.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,215.18 : 4,831.31 = 4,831.31 : x
2. Step 2: Convert to fraction form
   3,215.18/4,831.31 = 4,831.31/x
3. Step 3: Cross multiply
   3,215.18x = 4,831.31 × 4,831.31
4. Step 4: Simplify right side
   3,215.18x = 23,341,580.47
5. Step 5: Solve for x
   x = 23,341,580.47/3,215.18
6. Step 6: Final answer
   x = 7,259.81